Nb3Sn films on Cu via Cu-Sn diffusion achieve Q=77,000 at zero field in a test cavity, outperforming bare Cu for potential axion searches.
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Negative quadratic trace parameter β in f(R,T) = R + αT + βT² gravity with Chaplygin gas enables non-singular bounces via geometric NEC violation without exotic matter, with viable stability and de Sitter attractor.